Question

circumference of a circular path
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Answer 1

Step-by-step explanation:

Circumference of circle: The distance around the circular region is called its circumference. The ratio of circumference of any circle to its diameter is constant. This constant is denoted by π and is read as pie. 

Circumference/Diameter = Pie 

i.e., c/d = π   or   c = πd 

We know that diameter is twice the radius, i.e., d = 2r 

    C = π × 2r 

⇒ C = 2πr

Therefore approximate value of π = 22/7 or 3.14. 

Answer 2

Answer:

2πr or πd

Step-by-step explanation:

example: r = 7

2× 22/ 7× 7= 44cm